South Carolina has 46 counties, with 1 classified as EPA Zone 1 (highest risk). With an average radon level of 6.84 pCi/L, South Carolina state testing data reveals significantly elevated risks across multiple counties. Testing is highly recommended.
South Carolina is the 40th most expansive state in terms of size and the 24th most populous in the entire US.
South Carolina does have an active radon program, dedicated to educating citizens about the risks associated with the deadly gas. You can find more information on Radon, testing and mitigation at the official page.
Explore radon data organized by metro region, including average levels, hotspot cities, and local mitigation professionals.
Cities with the most user-submitted radon test data, ranked by number of submissions.
| City | Avg User Radon Level | Submissions |
|---|---|---|
| Fort Mill | 6.00 pCi/L | 1 |
| Greenville | 5.00 pCi/L | 1 |
All 46 South Carolina counties with their EPA radon zone classification and user-submitted average radon levels.
Browse radon data for individual cities across South Carolina. Each city page includes user-submitted radon levels, local contractors, and mitigation resources.